<!DOCTYPE html>
<html lang="zh-CN">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
  <title>knowledge</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    html {
      height: 100%;
    }

    body {
      height: 100%;
      background-size: cover;
    }
  </style>
</head>

<body>
  <div class="home">
    404
  </div>
</body>

</html>